Experimental-numerical method for calculating bending moments in swimming fish shows that fish larvae control undulatory swimming with simple actuation.

The fitted value of 517.7 m −1 results in a clear trend of vigour as a function of effort ( Fig 5B ; generalised linear model fit with gamma distribution and log link function: P < 0.0001), collapsing the broad clouds of speed and acceleration ( Fig 5C and 5D ).

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The slopes for the phase of the centre of volume are not significantly different from zero for length ( P = 0.32) and the interaction between length and vigour ( P = 0.065) but are marginally significant for vigour ( P = 0.049).

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